PSA.1 sp18.docx - Pre-Session Assignments(PSA#1 Name_Anjali Patel Complete the vocabulary-matching sections and at least the first three objectives for

PSA.1 sp18.docx - Pre-Session Assignments(PSA#1 Name_Anjali...

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Pre-Session Assignments (PSA) #1 Name ______Anjali Patel______________________________ Complete the vocabulary-matching sections and at least the first three objectives for each chapter. Doing so will prepare you for recitations and for the quizzes. You are highly encouraged to complete the rest of the objectives to keep you on track and so you can ask for clarification during recitation. All answers can be found in the textbook, even if a section has not yet been covered in lecture. Please print, complete, and bring to recitation. Chapter 21 Objectives: The Origin and Evolutionary History of Life 1. Describe the early conditions on early Earth and the requirements for life to begin - In the early conditions most of the gases that were present are carbon dioxide, water vapor, carbon monoxide, nitrogen, hydrogen sulfide, and methane. - The requirements for life to begin are little free oxygen so the atmosphere was reducing the environment, energy source, chemical building blocks including water and dissolved inorganic molecules and atmospheric gases were present, and time 2. Describe the Miller-Urey experimental model and explain how it could be used to investigate the synthesis of organic molecules (drawing helpful! ) - Miller-Urey experiments recreated the conditions like the Earth. He heated a flask that had water The results were that all 20 amino acids, bases for RNA and DNA, lipids, ATP, etc. 3. Compare and contrast protobionts, microspheres, and coacervates, and discuss their relationship to the hypothesis of “pre-cell life” 1 _D__ an organism that lives in or on another _B__ a specific type of protobiont containing enzymes used for more complex synthesis _C__ single membrane organelles originated by budding off the internal surface of the plasma membrane _E__ double membrane organelles arose from a symbiotic relationship in which the endosymbiont living inside the cell lost its autonomy and became incorporated as an organelle within that cell _G__ one type of protobiont; produced by adding water to abiotically formed polypeptides _F_ an organism not capable of producing its own organic molecules from inorganic materials (will be a consumer) _H__ a vesicle of abiotically produced polymers _A_ an organism capable of producing its own organic compounds from inorganic materials (photosynthesis for example) _I__ a column of prokaryote cells that become fossilized (living ones are extremely rare) A. Autotroph B. Coacervate C. Endo-membranous Theory D. Endosymbiont E. Endosymbiosis Theory F. Heterotroph G. Microsphere H. Protobiont I. Stromatolite
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- Protobionts are nonliving microspheres, have separate internal and external environments and they are excitable. They have energy to do work and they are also osmotically active so they can diffuse. And they have no DNA and don’t self-replicate. Division is spontaneous - M icrospheres are a type of protobiont formed by adding water to abiotically formed polypeptides.
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